from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

SQLALCHEMY_DATABASE_URL = "postgresql://postgres:cout<<liwftc123@localhost/lisdemo"

engine = create_engine(
    SQLALCHEMY_DATABASE_URL
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base=declarative_base()

def get_db():
    try:
        db = SessionLocal()  # 本地会话
        yield db
    finally:
        db.close()
        print('数据库已关闭')
